feat(agent): add app starter role in mutli agent

[cinjoseph]

Description

在多Agent的角色中增加了一个AppStarter角色，可以在前端直接选目标APP进行启动。

How Has This Been Tested?

Snapshots:

Include snapshots for easier review.

Checklist:

• [*] My code follows the style guidelines of this project
• [*] I have already rebased the commits and make the commit message conform to the project standard.
• [*] I have performed a self-review of my own code
• [*] I have commented my code, particularly in hard-to-understand areas
• [*] I have made corresponding changes to the documentation
• [*] Any dependent changes have been merged and published in downstream modules

[csunny]

The approach is to treat the app as a kind of resource for Agent to use, which scenarios will be used?

[cinjoseph]

@csunny magic
1 - Apps are also a resource that can solve problems. it can be treat a large tool.
2 - a big multiAgent may maintained by multiple teams. cascade App struct can help maintaining much easier

[csunny]

LGTM～

[yhjun1026]

r+